Measuring USB-C current consumption

Discussion in 'macOS Mojave (10.14)' started by laz232, Jan 10, 2019.

Tags:
  1. laz232, Jan 10, 2019
    Last edited: Jan 11, 2019

    laz232 macrumors 6502

    Joined:
    Feb 4, 2016
    Location:
    At a café near you
    #1
    Is there a terminal (or GUI) method of getting the USB-C current draw of an attached peripheral device connected to a MacBook Pro (actual draw, not class specification)? AFAIK the USB-C power monitor devices only pass through power, not full speed data.

    I would like to compare power consumption of some of the USB-C docks.
     
  2. BrianBaughn macrumors 603

    BrianBaughn

    Joined:
    Feb 13, 2011
    Location:
    Baltimore, Maryland
  3. laz232 thread starter macrumors 6502

    Joined:
    Feb 4, 2016
    Location:
    At a café near you
    #3
    Hi, that isn't USB-C and doesn't pass through USB-3.1 data.
     
  4. dwig macrumors 6502

    Joined:
    Jan 4, 2015
    Location:
    Key West FL
    #4
    Lon at Lon.tv in this YouTube vid seems to be using a device that would fit your needs:

     
  5. BrianBaughn macrumors 603

    BrianBaughn

    Joined:
    Feb 13, 2011
    Location:
    Baltimore, Maryland
    #5
    Do you want me to find one that specifically meets your needs? If so, list them here and I'll get on it next week.
     
  6. laz232 thread starter macrumors 6502

    Joined:
    Feb 4, 2016
    Location:
    At a café near you
    #6
    It appears (watching the video) that is only passes through power - I want to measure power consumption of attached peripherals.
    --- Post Merged, Jan 11, 2019 ---
    Not sure if that is missing a /s tag. I want to measure the current consumption of USB-C attached peripherals (as per original post) whilst they are operating in USB-C mode.
     
  7. HenryAZ macrumors 6502a

    HenryAZ

    Joined:
    Jan 9, 2010
    Location:
    South Congress AZ
    #7
    Well, you could take a short USB-C extension cable, cut off the insulation, isolate the two power wires and route them through your DMM in ammeter mode in series (inline).
     
  8. laz232 thread starter macrumors 6502

    Joined:
    Feb 4, 2016
    Location:
    At a café near you
    #8
    Thanks, but for various reasons I don't want to do that: the multiple wires that need to be cut, the burden voltage of the DMM and that I need to identify the 4 wires: (A4, A9, B4, B9).

    Also for the price of a USB-C extension cable here (no - there is no Amazon Basics available here) then I might as well put that into a device rather than a hack.
     

Share This Page